What causes spasticity in hemiplegia?

Updated: Feb 08, 2019
  • Author: Robert Gould, DO; Chief Editor: Stephen Kishner, MD, MHA  more...
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Spasticity is defined as a velocity-sensitive disorder of motor function causing increased resistance to the passive stretching of muscles and hyperactive muscle stretch reflexes. Following stroke, Teasell reported, supraspinal suppressor areas (pyramidal and extrapyramidal motor systems) that are normally responsible for maintaining the delicate balance between the facilitative and inhibiting influences of alpha and gamma motor neurons are decreased or eliminated, resulting in spasticity, flexor tone, and synergy. [4]

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